Turn signal. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices
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I propose a device that signals the inclusion of turns. When you turn on the left or right turn, fragments of melodies sound.
The scheme from [1] was taken as a basis, the operation of the digital part of the device is also described in detail, and a ROM programming table is given. By the way, extra lines OA0...11F are erroneously printed in this table. Some changes and additions have been made to the scheme (Fig. 1). The master tone generator is assembled on three elements DD1, the clock generator - on the remaining three elements of this IC. Chain R3-C3 is used to set the counter DD3 to "0". Counter DD4 is used for automatic enumeration of melodies and for storing the number of the last fragment. For this purpose, it is powered directly from the vehicle's on-board network through the ballast resistor R7. The input of the device is connected to the indicator lamp turns on the dashboard of the car.
The +5 V voltage stabilizer, together with the electronic key, generates the supply voltage for the microcircuits and keeps it until the end of the melody fragment. When you first turn on (when you turn on the ignition of the car), power is supplied to all ICs, the "end of the melody" bit (output D7 of ROM DD5) has a logic level of "1". This level opens the transistor VT1, which, in turn, closes the transistor VT2. On the zener diode VD2, the voltage is limited, and the stabilizer generates a voltage of +5 V. After the end of the melody, a logical "7" appears at the output D0, which leads to a voltage shutdown, and the signaling device goes into standby mode. When the turn is turned on, a voltage appears on the basis of the transistor VT1 (from the control lamp), which turns on the stabilizer. In this case, bit D1 is set to "7", and fragments of melodies sound until the turn is turned off. After turning off the direction indicator, the last melody sounds in full. A piezo-emitter VA1 of the ZP-2 type was used as a sound source.
(click to enlarge)
The design of the signaling device can be arbitrary. In my version, this is a 75x45 mm board placed in an 80x50x20 mm case. The emitter is located inside the case, but can be remote. The VT3 transistor is mounted on a radiator (20x15x4 mm in size). Some of the connections are made by printed wiring, some - by MGTF wire, some parts are soldered to the legs of the IC. The location of the parts is shown in Fig.2.
Establishment. By selecting the resistor R7, set the voltage to +5 V at the power output of the IC DD4. By selecting elements R1, C1, R2, C2, set the required tone and tempo for playing melodies. With proper installation and serviceable parts, the signaling device works immediately (tested on more than thirty copies).
Note. This signaling device is designed for installation in cars "Zhiguli", "Niva", "Volga". To install on the Moskvich, the signal from the lamp must be fed through a diode and a resistor to the base of the transistor VT2.
The dimensions of the signaling device can be further reduced, and the number of melodies can be increased to 60 ... 80, if the entire address space of the DD5 IC is filled with melodic codes, and instead of the DD3, DD4 ICs, the K561IE16 IC is used. Power consumption can be reduced by using the 555 or 1533 series ICs.
Literature
1. Evgrafov D. Electric musical machine. - Radio, 1993, N7, S.30-32.
Author: V. Gorkov, village of Bogodukhovka, Omsk region; Publication: N. Bolshakov, rf.atnn.ru
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